Abstract: The present invention provides a pavement deicing or snow-melting system, comprising a water-permeable pavement, a drainage device and a heating device, wherein the water-permeable pavement comprises, successively from the top down, a water-permeable asphalt concrete coating, a porous cement stabilized macadam layer, a reflecting layer, a waterproof layer, a semi-rigid base and a semi-rigid cushion; the drainage device comprises a drainage ditch and a sheet cover; a water inlet is formed on the drainage ditch; a lower edge of the drainage ditch is not lower than the waterproof layer; curbs are arranged on edges of the water-permeable asphalt concrete coating and the porous cement stabilized macadam layer; and, the heating device is arranged between the water-permeable asphalt concrete coating and the porous cement stabilized macadam layer.

Abstract: An integrally assembled hidden beam hollow two-way floor system includes precast slabs (1), honeycomb steel beams (3), and cast-in-place concrete (4). A plurality of compartments (12) arranged in a matrix is integrally provided on one surface of each of the precast slabs (1), and connecting grooves (14) are provided at a periphery of another surface of the precast slab (1) is provided with connecting grooves (14). Prepared bolt holes (13) penetrating through the precast slab (1) are provided in the connecting grooves (14). The honeycomb steel beam (3) serves as a primary beam or a secondary beam of a steel structure of the floor system. A surface of the precast slab (1) provided with no compartments is lapped and fixed between the secondary beams or between the primary beam and the secondary beam, and adjacent precast slabs (1) are connected and fixed by a U-shaped hoop (2) passing through the prepared bolt hole (13) to form a seam.

Abstract: A modular platform system includes a base module and at least one extension module. One side of the base module has a recess for receiving a connector on one side of the extension module to connect the extension module to the base module. The extension module may include a recess for receiving a connecting member on a second extension module to connect the second extension module to the extension module.

Abstract: Surface coverings, such as floor coverings, with an interlocking design are described. Methods of making the surface coverings are further described. A plank including a resilient composite sheet having four sides, an upper surface, a lower surface, and an overall thickness, and said composite sheet comprising at least one base layer, wherein said at least one base layer comprising at least one polymeric material and at least one filler, wherein opposite sides of the composite sheet comprise a first tongue on a first side and a first groove on the opposite second side, wherein the first tongue and first groove have complementary shape to each other to be interlockingly engageable with a corresponding groove or tongue on an adjacent floor plank.

Abstract: A ground cover mat for vehicles and equipment to cross over pipes, whether laid below or above ground, wherein the mat comprises two footing members spaced at a distance from each other. Each of the footing members define therein multiple peg holes, and each of the peg holes spaced at different distances from an outer edge of a given footing member. The mat also includes one or more span members. Each of the span members are positioned above and removably attached to the two footing members. Each of the one or more span members comprise at least two pegs that protrude downwards, wherein one of the pegs removably fit into a given peg hole defined in one of the two footing members and another one of the pegs removably fit into a given peg hole defined in another one of the two footing members.

Abstract: A connecting system for connecting concrete beams of a parking structure including a pair of concrete beams and a plurality of spring-like connectors connected between the pair of concrete beams. The concrete beams are each provided with an aperture and the spring-like connector is in a form of a pre-formed carbon fiber bundle or metal and has opposite ends that are secured in the apertures in the concrete beams by an adhesive.

Abstract: A grass protection mat comprises a body where grass passing spaces are continuously arranged and an outer frame comprising four frames formed in four directions to finish an outer edge of the body, wherein the grass protection mat further comprises at least one hook fastener which horizontally protrudes from a first lateral frame of the outer frame toward a second lateral frame of an outer frame of a neighboring grass protection mat, and wherein the at least one hook fastener is fastened to at least one fastening hole provided in the outer frame of the second grass protection mat adjacent to the first lateral frame and corresponding to the hook fastener of the grass protection mat.

Abstract: A solid state floor lighting unit comprises a printed circuit board carrying an array of solid state lighting elements and a protective cover. The cover has openings or other light output regions aligned with the solid state lighting elements to provide light output. The protective cover has at least one edge with downwardly projecting spaced supporting tabs. These tabs form a comb structure which enables adjacent units to be interlinked. In this way a reduced pitch between lighting elements across the join between units is made possible, but the protective cover still provides the required stiffness and robustness to carry heavy loads.

Abstract: A spring tension system for a floor tile has spring loop with a base portion and a hoop portion. The base portion has two arms extending outwardly at a first angle from a center-point which together to form the hoop portion. The spring loop is formed into a first side of a first floor tile. A tapered recess is formed into a second side of a second floor tile. The tapered recess includes an opening which forms two tapered walls which extend inwardly toward a center of the second floor tile at a second angle. The second angle is smaller than the first angle. The spring loop formed into the first side of the first floor tile is received into the tapered recess formed into the second side of the second floor tile, the spring loop contacting the walls of the tapered recess to form a friction fit.

Abstract: A set of essentially identical panels (1, 1?), such as building panels, provided with a mechanical locking system including a displaceable tongue (30), which is arranged in a displacement groove with a first opening at a first edge of a first panel (1). The displaceable tongue is configured to cooperate with a first tongue groove (20), with a second opening at a second edge of an adjacent second panel (1?), for vertical locking of the first and the second edge. The height of the first opening is greater than a second height of the second opening.

Abstract: A monolithic interlocking tile, manufacturing method, and covering are disclosed. A closed-cell foam material is injected into a mold to form a monolithic structure having a first surface, a second surface offset and opposite the first surface, the first surface including a first lip located at two adjacent sides of the structure with a plurality of shaped protrusions, and the second surface including a second lip located at two other adjacent sides of the structure and forming a plurality of shaped apertures matching in number and shape with the plurality of protrusions; and a recess formed in the second lip and forming a hole for receiving a fastener to secure the monolithic structure to a supporting structure. Multiple monolithic interlocking tiles are interlocked together to form the covering for a floor, wall, ceiling, or roof.

Abstract: The invention relates to a floor board having connection geometries corresponding to each other and made of plastics, wherein the first connection geometry is provided along two abutting side surfaces and has a groove which is open toward the bottom and is bordered by a lip toward the outside, and the groove has an undercut along its walls. The second connection geometry is provided along the abutting side surfaces and has a groove which is open toward the top and is bordered by a lip toward the outside, and the groove has an undercut along its walls. The lip of the first connection geometry and the lip of the second connection geometry each have at least one slot at least in sections. The invention also relates to a floor board having a connecting element that is made of a multi-component material.

Abstract: Methods of manufacturing a plurality of mats useful with a plurality of frame style seal members in a load-supporting surface include at least one milling machine, router or pre-formed mold forming at least first and second elongated grooves in first and second offset outer edges of at least a first side of each among at least first and second stepped-configuration, reversible mats. Each groove causes the seal member(s) seated therein to extend into a gap formed between the mats, abut at least one seal member extending from another mat into the same gap and form a liquid-tight seal therewith.

Abstract: Apparatus for forming a liquid-tight seal across gaps formed between adjacent components of a load-supporting surface useful at an outdoor worksite includes a liquid-impermeable, elongated, seal member configured to be sealing coupled to first and second mats in the load-supporting surface and extend across the gap formed therebetween.

Abstract: Apparatus for forming a liquid-tight seal across gaps formed between at least first and second adjacent mats in a load-supporting surface includes at least one seal member configured to be coupled to each among first and second outer edges of at least a first side of each among at least first and second adjacent mats and extend laterally outwardly therefrom into one among at least two gaps formed between the adjacent mats and abut at least one other such seal member extending into the same gap from the other adjacent mat that forms the gap.

Abstract: A container is disclosed. The container has a side part, an upper part, a lower part, and a cavity formed by the side part, the upper part, and the lower part. The container also has a material disposed in the cavity. The side part has at least one protrusion and at least one recess. The side part is permeable to water. The side part is also nonpermeable to the material disposed in the cavity.

Abstract: A building comprises an exterior substrate, such as an exterior prepped for application of a building material, having an expansion or control joint fixed to the substrate and a layer of a building material applied on the substrate and overlapping a portion of the expansion and control joint. A groove is formed between the expansion and control joint and the layer of building material, and a sealant is disposed in the groove, adhesively bonding to the expansion and control joint and the building material. For example, an M-shaped, cup-shaped or A-shaped removable gasket strip may be removably coupled to the expansion or control joint during application of the building material and may be removed, subsequently, to form the groove.

Abstract: Apparatus for forming a liquid-tight seal across a gap formed between adjacent, interconnected first and second mats in a load-supporting surface includes first and second liquid impermeable, elongated seal members extending into the gap from the first and second mats, respectively. The seal members abut one another in the gap to form a liquid tight seal therebetween.

Abstract: An illuminated platform system which improves safety by providing an illuminated and non-slip surface adapted for lining a surface such as a truck frame. The illuminated platform system generally includes one or more platforms which are adapted to be secured to a surface such as a truck frame. Each of the platforms is interlockable utilizing side apertures extending along the outer perimeter of the platforms in combination with fasteners and anchors. A light source such as a light string is positioned within an outer channel extending along the lower surface of the platforms. Light from the light source will emanate through both the side apertures and a plurality of upper apertures which extend along the outer perimeter of the platform along its upper surface. By interlocking the platforms and activating the light source, the surface such as a truck frame may be safely illuminated and adapted to store heavy objects.

Abstract: A self-locking paneling system is provided and includes: a panel defining a void therein and a pin positioned within the void; another structure configured to connect with the panel, the other structure comprising a receptacle; and a magnet positioned on at least one of the receptacle and the pin. When the panel and the other structure are positioned together, the pin is configured to move from a retracted position from within the void to an extended position to engage the receptacle using magnetic force produced by the magnet. The self-locking paneling system can be used for raised-flooring systems.

Abstract: A mat with an upper road side and a lower ground contacting side, the mat comprising: a frame supporting one or more boards; and a grapple receiver formed in an interior portion of the mat and indented from one or both of the upper road side and the lower ground contacting side to allow grapple jaws to grip the grapple receiver between the grapple jaws.

Abstract: Systems and methods are described for connecting a first mat tile to a second mat tile, including, but not limited to, a first bracket embedded in the first mat tile and a second bracket embedded in the second mat tile. In various embodiments, the first bracket includes a first pin hole while the second bracket comprising a second pin hole. Systems and methods further include a pin coupled to the first bracket through the first pin hole and to the second bracket through the second pin hole.

Abstract: A tactile plate assembly used as a tactile warning device on walkways comprises a plurality of tactile plates with texture for providing tactile awareness. A connecting bracket attaches first and second tactile plates to each other to form a pair of tactile plates. Interlocking brackets, having first and second ends, attach two pairs of tactile plates together, forming a tactile plate subassembly. The interlocking brackets each includes a first end with a tab extending at an angle and a second end with a hole. The interlocking brackets can mate with one another to allow connection of multiple tactile plate subassemblies together. The interlocking brackets include multiple holes of sufficient size to allow a substrate such as concrete or asphalt to flow therethrough to anchor the tactile plate assembly in place. The connecting brackets may also include similar holes of sufficient size to allow a substrate to flow therethrough.

Abstract: A pavement slab including top and bottom surfaces, first and second longitudinal side surfaces, and first and second transverse side surfaces. The slab includes a first and second plurality of transverse holes formed within the first and second longitudinal side surfaces, respectively, a first and second plurality of longitudinal holes formed within the first and second plurality of transverse holes, respectively, and plurality of dowel bars. Each of the holes is sized and shaped to receive slidably a corresponding one of the plurality of dowel bars. Each of the dowel bars is slidable between a retracted position and an extend position in which the dowel bar forms a joint between the slab and another slab or preexisting pavement.

Abstract: A modular concrete unit for load-bearing surfaces, and a concrete assembly having at least two modular concrete units connected by a hinging attachment. The modular unit has a top surface, a bottom surface, and at least three side walls extending between the top and bottom surfaces. The side walls of each modular unit include at least one engagement means configured for hinging attachment to a neighboring modular unit. The concrete assembly made from at least two modular units further includes at least one hinge pin connecting the engagement means of a first concrete unit and the engagement means of a second concrete unit.

Abstract: A lightweight polymer-based load bearing platform preferably including artificial turf for use as a synthetic turf block for easy installation, easy maintenance, and long term durability.

Abstract: A one piece water permeable paver for forming a surface suitable for traffic having outer flex joint connection cells connected to flex joints, outer three connection cells connected to one of the outer flex joint connection cells, outer two connection cells connected to two outer three connection cells, a plurality of inner single flex joint connection cells connected to one of the flex joints, and an inner dual flex joint connection cell engaging two flex joints, inner four connection cells connected to a pair of outer three connection cells and a pair of inner single flex joint connection cells. Fastening slots are formed partially through outer surfaces of cells that form two sides of the paver. Locking tabs extend from outer surfaces of cells forming two sides of the paver opposite the sides with the locking tabs, enabling a first paver to securely interlock to an adjacent paver.

Abstract: A modular sub-flooring system for supporting an overlayment above a ground surface includes a plurality of sub-floor tiles situated about a ground surface, with each sub-floor tile having a substantially-flat top surface that is adapted to receive and support an overlayment, and a connection interface with opposing engagement surfaces. The sub-flooring system also includes a plurality of removable bridge connectors, with each of the bridge connectors having a plurality of tile interfaces, and with each tile interface having complimentary engagement surfaces configured to engage with the opposing engagement surfaces of the connection interfaces. The tile interfaces of the bridge connectors couple to the respective connection interfaces of any adjacent sub-floor tiles to restrain the relative vertical movement between the adjacent sub-floor tiles while facilitating controlled relative lateral movement between the sub-floor tiles.

Abstract: Tactile detection embedment plates used in pedestrian walkways releasably aligned by a bracket on at least one of the embedment plates. The bracket can be mated with a bracket on another plate to define a receiver yoke in which a wedge is disposed for a releasable plate assembly connection.

Abstract: A modulated cell adapted to form a structural frame of said cells for supporting a load bearing feature of a roadway, pavement or walkway while at the same time providing a rooting area within the structural frame for a tree root network. The cell has a main body with vertical integral legs with a top plate having regions upon its upper skirting for a snap fit fastening arrangement for receiving the ends of said legs of a resting cell thereupon said top plate to mount one cell vertically upon another and the top plate has its peripheral edge an interlocking means for laterally joining together with adjacent cells so the modulated cells can be mounted vertically and laterally one upon the other and side by side.

Abstract: Tactile detection embedment plates used in pedestrian walkways releasably aligned by a bracket on at least one of the embedment plates. The bracket can be mated with a bracket on another plate to define a receiver yoke in which a wedge is disposed for a releasable plate assembly connection.

Abstract: A junction between successive flat pre-fabricated elements which comprises an elastic transverse insert (9), an approaching mechanism (10) in the form of tie beams (23) and tensioning mechanisms (19). The flat pre-fabricated elements (2) to be assembled each have a transverse channel (3) adapted so as to receive the insert along the end transverse edges (4, 5) thereof, which must face each other after assembly on the ground, and conduits (7) of the tie beams. Each pre-fabricated element is successively arranged, one after the other, and the transverse insert is introduced into the transverse housing (6) formed by transverse channels facing each other. The tie beams are introduced into the conduits, the ends thereof projecting outside the pre-fabricated elements. The tie beams are then tensioned by a tensioning mechanism, at each of the ends thereof, in order to immobilize the flat pre-fabricated elements and thereby connected by the tie beams.

Abstract: A pre-fabricated pavement slab installation and replacement system is provided. The system includes a connector having an axial opening therethrough and engagement surface within the opening. The system further includes a pavement slab and an adjacent pavement slab, wherein a portion of the connector is embedded in the pavement slab and a remaining portion of the connector is exposed. The adjacent pavement slab has an interconnection slot, that can cover the remaining portion of the exposed connector. The system further provides that under the condition that the pavement slab and the adjacent pavement slab are cut apart, the connector is cut into a first half and a second half, wherein the first half of the connector contains the first engagement component and the second half of the connector contains the second engagement component. The first half of the connector can be subsequently removed by engaging the engagement surface.

Abstract: A modular flooring system is disclosed which is designed to support heavy loads while providing stability and ground protection. The invention contemplates a modular mat having an integral main body with offset mounting and assembly flanges and a lattice interior. The mat is constructed from a unitary piece of high strength plastic. Each flange edge contains an outward radiused edge, while each non-flange edge contains an inward radiused edge. Each flange engages with a corresponding flange on an adjacent tile, allowing the outward radiused and inward radiused edges to properly mate. One or more metal cam locks located along the upper flange edges are secured into corresponding cam receptacles located along the lower flange edge. The mats may utilize optional top covers to prevent water and debris from entering the mats. The modular flooring system provides increased strength and stability and protection of the subsurface in heavy industrial applications.

Abstract: An exemplary ramp structure capable of being positioned over at least a portion of a cable protection system comprises first and second center portions, a first side ramp portion adjacent a side of each center portion, and a first tapered portion adjacent an end of the first side ramp portion. The first tapered portion may be tapered in at least two different directions that are substantially orthogonal to each other.

Abstract: The present invention relates to a road restoration block for covering eliminated pavements during various road constructions conducted by eliminating some of or the entire existing road pavements, and more specifically, to a road restoration block, which can quickly and safely cover the eliminated pavements by providing blocks that are simply carried, disposed, and disassembled with strong coupling power to the upper part of the eliminated pavements so that people and cars may pass even when the constructions are in progress, thereby providing a safe and pleasant construction environment by preventing the traffic congestion caused by the constructions.

Abstract: A grass protection mat and a mat assembly having the same are provided. The grass protection mat of the invention includes a body made of polygonal portions, pillars protruded upward from the body, buffer wings protruded upward from the body between the pillars for distributing weights, an outer frame at the periphery of the body, lug members protruded from lower parts of the body and the outer frame. The mat also includes slide-type hooking means laterally protruded for connection of the mats, an opening formed at the inner surface of the outer frame. The mat assembly includes various forms of mat fastening members for connecting the grass protection mats. The invention facilitates connection of the mats and enhances assemblability of the mat assembly, effectively preventing sinking of the mats into the ground, thereby maintaining protection of grass.

Abstract: A rig mat is formed by rectangular panels fastened end to end by cooperating connectors. In one arrangement the first connector is C-shaped shaped to form a slot and the second T-shaped shaped with a flange of the T wider than the mouth inserted through the mouth. In a second arrangement two L shaped connectors are interengaged with an additional flat plate which defines a slot with an end of one of the L-shaped connectors. The panels are composite and formed from a honeycomb core panel with a foam material filling the tubular cells and a fibrous reinforcing cover sheets extending over the top and bottom of the panel. The cover sheets are filled with a set resin material which extends into the porous fibrous material of the walls of the core panel so as to form an integral structure of the resin extending between the walls and the sheets.

Abstract: A clamping device for a portable porous pavement system includes a first bracket and a second bracket. The first bracket includes a U-shaped section extending between first and second wings; a first slot defined by the first wing; and a second slot defined by the second wing. The second bracket includes a C-shaped member having first and second arms with a base member joining the first and second arms; a first twistable section defined by the first arm; and a second twistable section defined by the second arm. The first arm is sized to fit through the first slot of the first wing such that the first twistable section and the base member are on opposite sides of the first wing; and the second arm is sized to fit through the second slot of the second wing such that the second twistable section and the base member being on opposite sides of the second wing.

Abstract: The invention is directed to reinforced ground cover mats which can be used to facilitate the passage of heavy equipment and vehicles on wet or disturbed ground. The ground cover mats are comprised of boards contained within a metal frame. A structural support in the form of an I-beam encases the boards and frame on one side, and a tubular member such as a pipe on the other side, thereby increasing the strength at the middle of the mat ends. Further, the tubular member can be modified at its ends to facilitate insertion of a sling and stacking of adjacent mats. The mat also comprises means for lifting, including passages through which chains or cable may be threaded, lifting shackle assemblies or pear link assemblies.

Abstract: A mat system includes a surface and at least first and second mat units. Each mat unit includes a respective plurality of blocks interlinked by respective cables that pass through the blocks. Each mat unit includes cable loops along at least one side section thereof. The first and second mat units are positioned on the surface in proximity to each other with cable loops of the first mat unit extending toward the second mat unit and cable loops of the second mat unit extending toward the first mat unit. A plurality of interconnecting blocks are positioned between the first mat unit and the second mat unit. Each interconnecting block includes an underside with downwardly open channels formed therein. The cable loops of the first and second mat units are positioned within the channels of the interconnecting blocks to cover the cable loops.

Abstract: This application relates to a light-weight, multi-purpose construction module. The module may be used, for example, as a mold for settable materials such as concrete. A plurality of modules may be aligned together in different configurations for use as a temporary road or support for use on unstable terrain, such as arctic tundra or wetlands. In yet another application the module may be deployed as a storage or shelving unit. The module comprises a deck and a plurality of wall elements projecting from the deck and defining a plurality of honeycomb-like compartments. The module may be used in conjunction with a mating cover for enclosing the module compartments. In one embodiment the cover may be coupled to the module in two different orientations. In one of the orientations connectors may be coupled to an outer surface of the cover. The connectors are useful for joining separate modules together and for providing the assembly with enhanced structural integrity, for example to support heavy loads.

Abstract: A pre-fabricated concrete slab system and method have matching rectangular slabs with cooperatively fitting male and female type connectors which fit adjacent to each other in a checkerboard fashion. The slabs include spaced reinforcing rods extending longitudinally and transversely therethrough. In at least some of the slabs, the rods' distal ends protrude outwardly away from one or more side edges of the slabs to form a plurality of male connectors. Correspondingly, at least some of the slabs include a plurality of corresponding female sockets on one or more sides thereof, each female socket receiving a corresponding male connector when dropped therein. Through interconnection of corresponding female sockets and male connectors by steel reinforcing bars extending in both the longitudinal and transverse directions, a continuous tension reinforcement is established between adjacent slabs in both the longitudinal and transverse directions.

Abstract: A modular floor apparatus comprising a modular-floor-locator section to be combined with a plurality of modular-floor tiles to form a flooring surface. The modular-floor-locator section may comprise a top surface and a first locator raised surface area formed in the top surface. The first locator raised surface area may be dimensioned to guide positioning of an object on the top surface.

Abstract: A panel apparatus comprises a tongue-in-groove connection connecting first and second panels. A support secured to one of the panels underlies the tongue-in-groove connection for support thereof when a load is applied.

Abstract: The invention is directed to interlocking ground cover mats that can be used to facilitate the passage of heavy equipment and vehicles on wet or disturbed ground. The ground cover mats are comprised of boards contained within a metal frame. The side surfaces of the mats are connected using an interlock member and an interlock opening. The end surface of the mats is connected using a retaining pin that feeds through openings in perpendicular plates, or alternatively using complimentary pins and recesses.

Abstract: A tile for an interlocking rubber mat includes a tile body having an upper surface, a lower surface, and a rectangular peripheral edge. The upper surface is imprinted with a repeating paving stone pattern of a square adjacent an octagon. Each square has four sides of equal length, and each octagon has every second side equal to the sides of the square. A series of projections extend beyond at least one side of the peripheral edge, the space between the projections being adapted to receive the projections of an adjacent tile. Each projection includes a projecting square and a projecting octagon, wherein the projecting square of each projection is adjacent a peripheral octagon of the at least one side of the peripheral edge and the projecting octagon is adjacent a remote side of the projecting square opposite the peripheral octagon. Each peripheral octagon on the at least one side having an associated projection.

Abstract: A ground covering support structure is provided comprising a plurality of longitudinally aligned boards secured to one another using a plurality of transversely extending rods; and at least one aperture formed in the access mat, the at least one aperture being aligned with a corresponding one of the rods such that an exposed portion of the corresponding one of the rods passes through the aperture, each the at least one aperture containing a retractable lifting link, the retractable lifting link comprising a lifting eyelet and an elongated slot; wherein the rod passes through the elongate slot to restrict movement of the link through the aperture. The boards may advantageously be constructed using recycled beetle kill lumber or similar recycled materials.

Abstract: A paving brick assembly includes: a plurality of polygonal main bricks, each of which has a plurality of first lateral sides and a plurality of second lateral sides that are alternately disposed with the first lateral sides, each of the first lateral sides being formed with a vertical protrusion, each of the second lateral sides being formed with a vertical groove and a horizontal groove; and a plurality of polygonal connecting bricks, each of which has a pair of opposite connecting lateral sides and a pair of opposite coupling lateral sides. Each of the connecting lateral sides is formed with a connecting protrusion. Each of the coupling lateral sides is formed with a coupling groove.

Abstract: A clamping device for a portable porous pavement system includes a first bracket and a second bracket. The first bracket includes a U-shaped section extending between first and second wings; a first slot defined by the first wing; and a second slot defined by the second wing. The second bracket includes a C-shaped member having first and second arms with a base member joining the first and second arms; a first twistable section defined by the first arm; and a second twistable section defined by the second arm. The first arm is sized to fit through the first slot of the first wing such that the first twistable section and the base member are on opposite sides of the first wing; and the second arm is sized to fit through the second slot of the second wing such that the second twistable section and the base member being on opposite sides of the second wing.